Decatur weather in February: Decatur, Illinois: normal highs, lows, rain and records for February
Decatur in February has a normal high of 40°F and a normal low of 23°F, a daily mean of 32°F, rising from 36°F on the 1st to 45°F by the 29th. Measurable precipitation falls on 7 days in a normal February, 1.84 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 4°C and low of −5°C, 47 mm of precipitation in February.
- NOAA stationDecatur Airport
- Station IDUSW00003887
- Location39.83°N 88.87°W
- Elevation675 ft (206 m)
- From the center4 miles
- Population68,763
- Jan 35° 20°
- Feb 40° 23°
- Mar 52° 32°
- Apr 64° 42°
- May 74° 53°
- Jun 83° 62°
- Jul 86° 66°
- Aug 84° 63°
- Sep 79° 55°
- Oct 66° 44°
- Nov 51° 34°
- Dec 40° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Decatur in February?
The normal high is 40°F and the normal low 23°F, for a daily mean of 31.6°F. February is 4.2°F warmer than January and 10.5°F cooler than March. February is the 11th warmest month of the year in Decatur and the 12th wettest. Across the month the normal high rises 9°F, from 36°F on February 1 to 45°F on February 29. From one year to the next February's mean temperature typically moves about 5.4°F either way (NOAA's standard deviation), so roughly two Februarys in three average between 26°F and 37°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 29%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| February 1 | 36°F | 20°F | 25% | 12% |
| February 8 | 37°F | 22°F | 25% | 13% |
| February 15 | 40°F | 23°F | 26% | 14% |
| February 22 | 42°F | 26°F | 28% | 15% |
| February 28 | 45°F | 27°F | 29% | 15% |
Every day of February: normal high, low and chance of precipitation (warmest afternoon February 29, coldest night February 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| February 1 | 36°F | 20°F | 25% | 12% | 10 h 10 min |
| February 2 | 36°F | 20°F | 25% | 13% | 10 h 10 min |
| February 3 | 36°F | 21°F | 25% | 13% | 10 h 10 min |
| February 4 | 36°F | 21°F | 25% | 13% | 10 h 20 min |
| February 5 | 37°F | 21°F | 25% | 13% | 10 h 20 min |
| February 6 | 37°F | 21°F | 25% | 13% | 10 h 20 min |
| February 7 | 37°F | 21°F | 25% | 13% | 10 h 20 min |
| February 8 | 37°F | 22°F | 25% | 13% | 10 h 20 min |
| February 9 | 38°F | 22°F | 25% | 13% | 10 h 30 min |
| February 10 | 38°F | 22°F | 25% | 13% | 10 h 30 min |
| February 11 | 38°F | 22°F | 25% | 13% | 10 h 30 min |
| February 12 | 39°F | 23°F | 26% | 13% | 10 h 30 min |
| February 13 | 39°F | 23°F | 26% | 13% | 10 h 40 min |
| February 14 | 39°F | 23°F | 26% | 14% | 10 h 40 min |
| February 15 | 40°F | 23°F | 26% | 14% | 10 h 40 min |
| February 16 | 40°F | 24°F | 26% | 14% | 10 h 40 min |
| February 17 | 40°F | 24°F | 27% | 14% | 10 h 50 min |
| February 18 | 41°F | 24°F | 27% | 14% | 10 h 50 min |
| February 19 | 41°F | 25°F | 27% | 14% | 10 h 50 min |
| February 20 | 42°F | 25°F | 27% | 14% | 10 h 50 min |
| February 21 | 42°F | 25°F | 28% | 14% | 11 h |
| February 22 | 42°F | 26°F | 28% | 15% | 11 h |
| February 23 | 43°F | 26°F | 28% | 15% | 11 h |
| February 24 | 43°F | 26°F | 28% | 15% | 11 h |
| February 25 | 44°F | 27°F | 28% | 15% | 11 h 10 min |
| February 26 | 44°F | 27°F | 29% | 15% | 11 h 10 min |
| February 27 | 45°F | 27°F | 29% | 15% | 11 h 10 min |
| February 28 | 45°F | 27°F | 29% | 15% | 11 h 10 min |
| February 29 | 45°F | 28°F | 29% | 15% | 11 h 20 min |
- Normal high
- 40°FFebruary average
- Normal low
- 23°FFebruary average
- Precipitation
- 1.84 inmonth total
- Days with precipitation
- 70.01 inch or more
- Nights at 32°F or colder
- 24
- Daylight
- 10 h 10 min to 11 h 10 minFebruary 1 to February 28
- Sunshine
- 65%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00003887; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Decatur in February?
On a given February day the chance of 0.01 inch or more is 26% on average, highest around February 29 (29%). In all, 1.84 in falls on 7 days of a normal February.
In a normal February in Decatur, 24 nights fall to freezing and 9 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00003887.
How humid and windy is Decatur in February?
At 3 p.m. the normal temperature is 42°F with 59% relative humidity and a dew point of 28°F; at 6 a.m. it is 30°F with 81% humidity. The wind averages 11.7 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 30°F | 25°F | 81% | 10.1 mph | 47% |
| 9 a.m. | 34°F | 26°F | 74% | 12.6 mph | 47% |
| noon | 40°F | 28°F | 63% | 13.5 mph | 45% |
| 3 p.m. | 42°F | 28°F | 59% | 13.8 mph | 42% |
| 6 p.m. | 38°F | 28°F | 67% | 11.3 mph | 44% |
| 9 p.m. | 35°F | 28°F | 74% | 10.8 mph | 54% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00003887. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for February in Decatur?
The warmest February temperature on this station's record (since 2000) is 77°F, on February 27, 2024; the coldest is −10°F, on February 11, 2014. The wettest February brought 5.13 in (2008).
The February mean against the 1991-2020 normal of 31.6°F: 2021 22.3°F (−9.3), 2022 28.5°F (−3.1), 2023 37.4°F (+5.8), 2024 40.3°F (+8.7), 2025 31.6°F (at normal), 2026 34.6°F (+3.0). 3 of 6 ran warmer than normal.
| February | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 22.3°F | −9.3°F | 1.72 in |
| 2022 | 28.5°F | −3.1°F | 3.69 in |
| 2023 | 37.4°F | +5.8°F | 2.17 in |
| 2024 | 40.3°F | +8.7°F | 0.59 in |
| 2025 | 31.6°F | at normal | 0.11 in |
| 2026 | 34.6°F | +3.0°F | 0.52 in |
Source: records: ACIS, station USW00003887; recent months: ACIS, station USW00003887. Records and recent months use complete months only.
How does February in Decatur compare across Illinois?
Across the 144 places PlainClimate covers in Illinois, February normal highs run from 31°F in Galena to 50°F in Anna; Decatur's is 40°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.